feat: add chrony

Applications/System/chrony.md

@@ -0,0 +1,28 @@
+# [chrony](https://git.tuxfamily.org/chrony/chrony.git)
+
+| Distribution | Package  |
+| ------------ | -------- |
+| Arch Linux   | `chrony` |
+| Ubuntu       | `chrony` |
+
+## Network Time Security
+
+https://developers.cloudflare.com/time-services/nts/
+
+https://system76.com/time
+
+Edit `/etc/chrony/chrony.conf`:
+
+```txt
+server time.cloudflare.com iburst nts
+server virginia.time.system76.com iburst nts
+server ohio.time.system76.com iburst nts
+server oregon.time.system76.com iburst nts
+```
+
+Verify:
+
+```sh
+chronyc sources -v
+sudo chronyc authdata -v
+```

appearance.md

@@ -5,6 +5,7 @@
 List fonts:
 
 ```sh
+# Linux
 fc-list
 ```
 
@@ -64,3 +65,7 @@ fc-list
 | ------------ | ------------------------- |
 | Arch Linux   | `ttf-fantasque-sans-mono` |
 | Ubuntu       | `fonts-fantasque-sans`    |
+
+[agave](https://github.com/blobject/agave)
+
+[APL385 Unicode](https://apl385.com/fonts/index.htm)